Crank arm and shaft



'(No Model.)

Wm a

OSP Rm MA M MR DLA m AA R .C

' W/TNESSES YN: imams Pntns co. vno'roufno.. wAsmNcroN, [i c.

UNITED STATES PATENT OFFICE.

ALEXANDER P. MCRROYV, CF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE ECLIPSEBICYCLE COMPANY, OF BEAVER FALLS, PENNSYLVANIA.

CRANK ARM AND SHAFT.

SPECIFICATIDN forming part of Letters Patent No. 485,350, dated November1,1892.

, Application led August 30,1892. Serial No. 444,505. (No model.)

To all whom t may concern,.-

Be it known that I. ALEXANDER P. MOE- ROW, a citizen of the UnitedStates, residing at Indianapolis, in the county of Marion and State ofIndiana, have invented certain new and useful Improvements in Crank Armsand Shafts,of which the following isaspecifieation.

The object of my said invention is to provide an improved means ofuniting a crank arm to a shaft, which shall be both inexpensive tomanufacture and secure in its Operation.

Said invention will be first fully described, and then pointed out inthe claims.

Referring to the accompanying drawings, which are made a part hereof,and on which similar letters of reference indicate similar parts, Figurel is a front elevation Of a crank arm and shaft embodyingr my saidinvention as applied to a bicycle-pedal; Fig. 2, a similar view of afragment of the arm and shaft separately on an enlarged scale; Fig. 3, asectional View On the dotted line 3 3 in Fig. 2; and Figs. 4 and 5,sectional views on the dotted lines 44 and 5 5, respectively, in Fig. 3.

In said drawings the portions marked A represent the crank-shaft, B thecrank-arm, and C a bolt by which the Vtwo are clamped together.

The shaft A is an ordinary shaft, except that it has aneccentrically-set projection a on its end, behind which is preferably atransverse groove for the bolt.

The crank-arm B is slitted where it passes over the crank-shaft and isbored to tit the form of crank-shaft just described-that is, a socket isbored therein to receive the end of the shaft and a hole smaller indiameter than the socket is continued through to receive the eccentricprojection. Another hole is bored transversely of these holes to receivethe bolt, and this last-mentioned hole should intersect theboundary-line of the shaft hole or socket.

The bolt C is an ordinary bolt and passes through the hole in the end ofthe crank-arm, and one side of said bolt also iits into the grooveformed to receive it in the crank-shaft.

The operation is as follows: The crank-arm is placed on the crank-shaft,as shown. This is permitted to be easily done by the slitted form of thearm. The bolt is then passed through its hole and tightened up, whichdraws the two sides of the crank-arm toward each other, clamping themtightly onto the shaft, and also by means of the groove in said shaftserves as a pin, which holds it on and to position. The eccentricprojection prevents any possibility of one part turning on the other. Bymeans of this construction the Whole device is enabled to be made byturning and boring and requires no square Or dat fitting or vthe formingof any keyways, while at the same time the parts are attached togetherwith more than usual security.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. The combination of a crank-shaft having an eccentric projection and acrank-arm having a socket to receive the end of the shaft and a deepersocket or hole to receive said projection.

2. The combination of a crank-shaft having an eccentric projection and acrank-arm slitted at the end and provided with a socket for the end ofthe shaft and a deeper socket or hole for said projection and a boltwhereby the two parts of the arm may be clamped tightly onto the shaft.

3. The combination of the crank-shaft having a transverse groove, thecrank-arm slitted at the end and provided with a socket or hole toreceive the shaft, and a hole transversely thereof and intersecting saidsocket or hole to receive a connecting-bolt, a groove in the shaftcorresponding to said transverse hole, and a bolt passing through thesame, which thus serves both as a pin to prevent longitudinal movementand as a clamp -bolt to clamp the arm firmly onto the shaft,substantially as set forth.

In witness whereof I have hereunto set my hand and seal, atIndianapolis, Indiana, this 23d day of August, A. D. 1892.

ALEXANDER I. MORROW. [L. 5.]

Witnesses:

H. H. FULTON, CHESTER BRADFORD.

